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Acceleration of brain tubulin formation in the optic lobe of the chick embryo by light stimulation (1987)

Zhang, J. ; Huether, G. ; Neuhoff, V.

Springer

Neurochemical research 12 (1987), S. 331-334

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ISSN: 1573-6903

Keywords: Brain tubulin formation ; light stimulation ; optic lobe

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract The effect of light exposure on the protein patterns of optic lobe and forebrain of the chick embryo was analysed by a high-resolution micro-two-dimensional polyacryamide gel electrophoresis and computerized quantitation. Experiments were done on three groups of eggs: control group was incubated in the dark; simultaneously, in the same incubator, one group of eggs was illuminated by constant light, another by intermittent light (3 sec interval) from day 10 to day 16 of incubation. In embryos exposed to intermittent light the relative amount of tubulins was significantly increased in the optic lobe. In the frontal lobe no effect of light exposure on the concentration of tubulins was seen. The rise of tubulins in the optic lobe was only caused by intermittant light. Continuous illumination of the eggs for the same period under otherwise identical incubation conditions was ineffective.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00993240

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Optical activity based on macromolecular asymmetryPart XXVI of Haloaldehyde Polymers; Part XXV : E.G. Brame, A. M. Raevsky, G. K. Semin, G. D. Jaycox, and O. Vogl, Polymer Bulletin 10(11/12), 521 (1983) (1985)

Vogl, Otto ; Corley, L. Steven ; Harris, William J. ; [et al.]

New York : Wiley-Blackwell

Die Makromolekulare Chemie 13 (1985), S. 1-12

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ISSN: 0025-116X

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: Optically active isotactic polychloral was prepared in which the optical activity comes exclusively from molecular asymmetry (i.e., helical conformation). Molecular asymmetry requires a high conformational energy barrier for the polymer backbone, and an asymmetric initiator to induce a predominance of one helical screw-sense. Polychloral meets the criteria. Asymmetric initiators used to obtain optically active polychloral include tetramethyl ammonium (+)- or (-)-0-acetylmandelate, tetramethylammonium (+)- or (-)-0-methylmandelate, the lithiumalkoxides of methyl (+)- or (-)-mandelate, lithium cholesten-3β-oxide, lithium cholestan-3β-oxide, and lithium (+)- or (-)-2-octanoxide. Using the above initiators at 0.5 mol %, a maximum specific rotation of [α] D25 = 5000 was obtained for polychloral. Errors in specific rotation were typically ±7%.